Location and boring of position holes



Aug. 26, 1952 D. E. STAINTON 2,503,113

' LOCATION AND BORING 0F POSITION HOLES I Filed Feb. 20, 1948 2 SHEETS-SHEET 1 Iz1/v era/@01 ,1). E sta/z/zzjt 0.21)

Aug. 26, 1952- D. E. STAINTON LOCATION AND, BORING 0 POSITION HOLES Filed Feb. 20, 1948 2 SHEETS-SHEET 2 r ll 1.

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Patented Aug. 26, ,1952

" iocarrolv AND BORING F POSITION HOLES Dudley Ernest Stainton, Rickmansworth, England, assignor to Precision Grinding Limited, "Mitcham Junction, England Application February 20, 1948, Serial No. 9,787 In Great Britain December 7, 1945 Section 1, Public Law 690, August 8, 1946 Patent expires December 7, 1965 18 Claims. (01. 7762) .This invention relates tothe location and bormg or drilling, grinding and lapping of position holesand is an improvement in or modification of the invention claimed'in my British Patent No. 565,716.

According to one-feature of the present invention each arm or side of the triangular frame is provided with independent means for locking the tool guiding bushes and adjustable length means together to form a rigid assembly so that the triangular frame comprises three rigid arms or sides connected together by the bush elements.

According to one form the elements comprising each arm or side are locked together by an independent flexible linear element such as a tape of steel or other suitable material.

Alternatively the elements comprising an arm or side are connected together by screw length rod means preferably including a member for accommodating'one or more precision discs.

The tool guiding bushes may comprise hinged devices or knuckles.

In the accompanying drawings: 1 Figure 1 is a plan of the improved position hole locating device according to the invention,

, Figure 2 is an elevation of one arm or'side of the triangular frame,

Figure 3 is a plan of a modified form of the invention, and 1 a Figure 4 is a partial elevation of one arm or side of the modified form.

In carrying the invention into effect according to one convenient-mode by way, of example, see Figures 1 and 2, the triangular frame is composed of knuckle or hinge elements I arranged at the apices of a triangle and adapted to be spaced the desired distances apart by inserted length bars and/or slip gauges 2, or adjustable slip gauges 3 as described in my British patent specifications Nos. 564,065 and 572,357.

Each knuckle unit I comprises a pair of elements or leaves 4, 5 having complementary interengaging hinge parts bored to receive a hinge pin or retaining bush 6. One leaf 5 may be provided with a pair of spaced hinge parts or ears Thetween which a centrally disposed hinge part or ear 8011 the other leaf 4 is adapted to be located.

The leaf 5 having the spaced ears 1 is provided with a centrally disposed inner curved surface 9 adapted to form an abutment for a locking tape in formed of steel or other suitable material.

The other leaf 4 is provided on one face with means for anchoring the end of the tape in and on the other face with means for tensioning the tapev Theearsl, 8 on the leaves are of circular form, the leaves being of a width equal to the radius of the circle, one face preferably being tangent tothe circle, the other passing .throughthe axis.

The means for anchoring the tape 40 comprises a tapped hole I l on the face which extends through said axis and accommodates a headed screw 12 which passes through an aperture in the tape. j v

The tape tensioning means comprises an open end box-like guiding structure or housingv I3 secured on the side of the leaf which is tangent to the circle andaccommodates a tension block it which is adapted to lee-secured to the end of the tape by a screw 15. The end wall 15 of the box is provided with a slot oraperture for the tape, positioned so that the tape will lie, against the side of the leaf. The block Mis provided with a tensioning screw l1 adapted to bear against the end wall [6 of the box whereby the block may be moved along the face of the leaf. Said face is suitably recessed or grooved at I8 to accommodate the head of the screw 15 by which the tape is secured to th block, and permit withdrawal and adjustment of the tension blockand attached trape- I t In locking theknuckles together, the appropriate slips and/or length bars being in position between the gaugingsurfaces 40, the tape ID comprising a steel ribbon of suitable gauge is secured at one end to the'tension block M, the other end is passed through the slot at ,the bottom of the guiding box and passed around the curved guide surface 9 of the knuckle element at the other end of the slips and bars then back along the inner side and its end secured to the innerv surfaceof the first knuckle by the screw l 2. Tension is then put on the tape by the screw IT on the-block M to lock the whole of the parts together. 1

The other sides of the triangular frame ar similarly locked-up byindependent tapes so that a triangular frame is provided.

The hinge pin or bush 6 for each knuckle unit I is providedwith a head I 9 having a reduced diameter projection l9a at one end and a removable collar 20 at the other. The pin extends beyond the collar 20. Theremovable collar 20 may be held in place by a locking screw.

The heads and ends of thehinge pins may be squar to the axis or domed and-the'bores are chamfered equally at each end, as shown, to ac- -'commodate aspherical'locating boss on a clamp- The collar 20 "'a'y -be tapped diametrically through both walls, one hole accommodating the 3 locking screw while the other may be utilised for an indicating attachment for testing any change of length between two collars when the triangle is assembled.

The diameter of the head 19 and collar 20 is preferably somewhat larger than the ears of the hinging leaves so that by removing one hinge pin the arms, of the triangular frame may be laid out in extension of one another. The enlarged heads also facilitate swinging the assembly under a comparator for testing lengths.

According to a modified form, see Figures 3 and 4, for use with length bars or rods adapted to be screwed together, the knuckle element 24 having the single ear is provided with a tapped hole 26 to receive the screwed end of a length bar or rod 21. The complementary knuckle element 25 having spaced cars is provided with a. longitudinally extending hole 28 intersecting a transverse aperture 29. The longitudinal hole and transverse aperture are adapted to accommodate a screwed pin 30 and washer 3| with a spherical seating, and a nut 32. The nut 32 is provided with a spherical surface adapted to engage the spherical seat of the washer 3|. The screwed pin 30 is adapted to be screwed into the adjacent length bar 33 and one or more precision discs or circular slips 34 are slipped over the screwed pin to provide the necessary increment to make up the desired distance between the knuckle axes. By rotation of the nut 32 by a suitable tommy bar the knuckle element 25 is locked up to the adjacent length bar 33 and discs 34 thus providing a rigid side for the frame.

The discs 34 may be complete rings, or may have open ended slots to facilitate positioning on the screwed pin 30.

This method of locking up the length elements to the knuckles may be used alone or in conjunction with the locking tape as the knuckle elements would preferably be provided with the curved surface 35 and the tape anchoring and tensioning devices 36, 31 as described in the previous modification.

In the form of the invention shown in Figure 3 the horizontal side is shown as having both tape locking and locking by a nut and screwed pin in connection with length rods and discs screwed together; the vertical side is shown with length bars or slips and adjustable slips locked up by a tape; while the inclined side comprises a screwed length rod and discs 36 and locking screwed pin and nut.

Instead of the knuckles being provided with spaced ears and a central ear respectively they may comprise elements having multi-joints or a half-lapped joint.

Instead of the ears being of a diameter twice the width of the leaf they may be of larger dimensions provided with an aperture large enough to accommodate a grinding or lapping head attachment for accurately positioning the axis of the tool for truing distortion of a hole.

While the invention is primarily intended for assembling the sides of a triangular frame for boring or grinding and lapping position holes it will be appreciated that by the invention a pair of knuckles with the appropriate length bars and/or slips and adjustable slip or screwed length rods and discs may be locked up rigidly to locate the position of a pair of holes. With such an arrangement the free elements of the knuckles may be utilised either with or without slips for locating a pair of holes from a datum line, the line between the position holes being parallel or .not to the datum.

A single knuckle element may be used for slipping and locating and boring and lapping holes from a single surface or from two surfaces at a right angle or any other angle to one another including a pair of spaced surfaces parallel to one another.

It will be appreciated that the surfaces of the knuckles will be finished and disposed relatively to one another as in the specification of the British Patent 565,716 above mentioned, thus the end gauging surfaces 40 will be lapped parallel to the axis of the apertures and spaced from said axis a standard distance say 1" or 2".

I claim:

1. Means for locating and guiding tools in the drilling, boring or lapping of position holes, comprising a triangular frame each apex of which is defined by a hinging knuckle unit including complementary hinglng elements having coinciding apertures and a tool guiding bush removably seated in each of said apertures, each side of the triangular frame being defined by length means located between a pair of said hinging elements and locking means for lockin said length means and said pair of hinging elements together to constitute a rigid arm assembly, the locking means for each arm being independent of the locking means of the other arms so that the triangular frame comprises three rigid arm assemblies detachably connected together by said tool guiding bushes to form a rigid structure, the angles and sides of which are constant for each setting.

2. Means for locating and guiding tools in the drilling, boring or lapping of position holes as claimed in claim 1, wherein the locking means comprises a flexible linear steel tape element.

3. Means for locating and guiding tools in the drilling, boring or lapping of position holes as claimed in claim 2, wherein one element of each knuckle unit is provided with a curved surface for engagement by the tape and the other element of each knuckle unit is provided with tape anchoring means and tape tensioning means.

4. Means for locating and guiding tools in the drilling, boring or lapping of position holes as claimed in claim 1, wherein the knuckle elements comprising each arm are connected together by screwed length rod means.

5. Means for locating and guiding tools in the drilling, boring or lapping of position holes as claimed in claim 1, wherein one element of each knuckle unit is provided with a blind threaded hole, and the other element of each knuckle unit is provided with a longitudinally extending recess intersected by a transverse recess, a spherically seated aligning nut and washer located in said transverse recess, and a screwed pin located in said longitudinally extending recess and screwing into said nut whereby the element having the intersecting recesses may be locked up to an adjacent length rod, and precision discs located between the element and the length rod.

6. Means for locating and guiding tools in the drilling, boring or lapping of position holes as claimed in claim 5, wherein the element having the intersecting recesses is provided with a curved surface, and the other element is provided with tape anchoring means and tape tensioning means, said locking means comprising a steel tape connected to said anchoring means and said tension means and passing around and engaging said radiussed surface.

7. Means for locating and guiding tools in the boring of a. pair of position holes, comprising a pair of end elements having tool guiding bushes,

intermediate length means located between the end elements and a flexible steel tape for locking said end elements and intermediate length means together to form a rigid assembly, one of the end elements having a radiussed surface for engagement by the tape, the other end element having tape anchoring means and tape tensioning means.

8. Means for locating and guiding tools in the boring of a pair of position holes as claimed in claim 7, wherein the end elements comprise knuckle units each comprising a pair of elements hinged together by removable tool guiding bushes, the intermediate length means being locked to one element of each knuckle unit whereby the remaining elements are free for location relatively to a datum line.

9. Means for locating and guiding tools in the boring of a pair of position holes comprising a pair of end elements having tool guiding bushes, intermediate screw length rod means located between and screwed to said end elements and precision discs located between each end element and said length rod means in abutting relation thereto.

10. Means for locating and guiding tools in the boring of a pair of position holes as claimed in claim 9, wherein said end elements, length rods and precision discs are clamped together by a flexible steel tape.

11. Means for locating and guiding tools in the boring of a pair of position holes as claimed in claim 9, wherein the end elements comprise knuckle units each comprising a pair of elements hinged together by removable tool guiding bushes, the intermediate screw length rod means being screwed to one element of each knuckle unit whereby the remaining elements are free for location relatively to a datum line.

12. Means for locating and guiding tools in the boring of a pair of position holes as claimed in claim 9, wherein the end elements comprise knuckle elements having interengaging apertured circular ears through which the tool guiding bushes extend, said bushes having circular concentric heads and collars of a diameter larger than the diameter of said ears.

13. Means for locatingand guiding tools in the boring of a pair of position holes as claimed in claim 9, wherein the end elements comprise knuckle elements having interengaging apertured ears.

boring, drilling or lapping of position holes comprising a knuckle unit having a pair of elements 14. Means for locating and guiding tools in the r said length means may be secured to said gauging surface and extend in a direction normal to said surface.

15. Means for locating and guiding tools in the boring, drilling or lapping of position holes as claimed in claim 14,'wherein one of said elements is provided with a tape guiding and abutment surface and the other of said elements is provided with tape anchoring and tape tension means.

16. Means for locating and guiding tools in the boring, drilling or lapping of positionholes as claimed in claim 14, wherein each of said elements is provided with screw means, said length means being threaded on said screw means to secure said length means to said elements to extend in a direction at right angles to said lapped gauging surfaces.

17. Means for locating and guiding tools in the boring, drilling or lapping of position holes as claimed in claim 14, wherein one element comprises a leaf with spaced apertured ears, the other element comprises a leaf with a centrally disposed apertured ear which is adapted to lie between said spaced ears with the apertures in coincidence to receive the tool guiding bush, the leaf of said first-named element having spaced ears be ng formed with an inner radiussed tape guiding surface, the leaf of said second-named element having a central car being provided with tape anchoring and tape tensioning means.

18. Means for locating and guiding tools in the boring, drilling or lapping of position holes as claimed in claim 14, wherein each element comprises a leaf with an apertured ear formation, said tool bush extending through said apertures, said bush having a head at one end and a removable collar at the other end, each of said ends being provided with a coned recess to accommodate a hollow ball clamp, said ears being of circular shape, said head and collar of the tool bush being of a larger diameter than the ears.

DUDLEY ERNEST STAINTON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS OTHER REFERENCES American Machinist, May 5, 1921, pgs. 770-772, volume 54, No. 18.

American Machinist, February 23, 1928, pgs. f

349350, volume 68, No. 8. 

